As the biggest seaport in Korea, Busan has an abundance of seafood. Severely, if you want your fish then Busan are going to be a playground for you, every handful of metres is usually a seafood cafe with big tanks bursting with species like Crab, Hagfish and Flounder. Look into https://clayton2xkvf.ampedpages.com/facts-about-summer-holiday-haeundae-revealed-63591961